Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: What's the purpose of Thiosulfate?

  1. Back To Top    #1

    What's the purpose of Thiosulfate?

    Taylor's requires 2 drops pf R-0007 before adding R-0008. Just wondering why and if one didn't add it, what would be the result? Does it help isolate the base factor better (truer reading) by canceling out other factors that make up Total Alkalinity?
    Thanks,
    Barry
    Sundance Hot Tub 365 gal, acrylic
    (2) 2.5 hp pumps
    ozonator
    Northwest Ohio resident

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: What's the purpose of Thiosulfate?

    Thiosulfate eliminates any chlorine that might be in the water. This is done because chlorine can react with the dye causing the test to be more difficult to read correctly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: What's the purpose of Thiosulfate?

    Thanks,
    Would not the amt thiosulfate required depend on how much chlorine is in the sample instead of the standard 2 drops?
    Sundance Hot Tub 365 gal, acrylic
    (2) 2.5 hp pumps
    ozonator
    Northwest Ohio resident

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: What's the purpose of Thiosulfate?

    Typically, the amount required is way less than 2 drops, fortunately adding extra doesn't cause any problems. Since it is tricky to know if you have added enough, the directions simply have you add way too much so you know it is taken care of.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Re: What's the purpose of Thiosulfate?

    Cool. Thanks again, Jason - just what I was wondering about.
    Sundance Hot Tub 365 gal, acrylic
    (2) 2.5 hp pumps
    ozonator
    Northwest Ohio resident

  6. Back To Top    #6
    Guest

    Re: What's the purpose of Thiosulfate?

    If the indicator dye turns blue instead of green (this occurs at high shock levels) then you can redo the test add an additional drop or two of thiosulfate when doing this test. If you don't your endpoint will turn light yellow instead of red. The test is still valid, just harder to determine the endpoint.

  7. Back To Top    #7

    Re: What's the purpose of Thiosulfate?

    Makes sense...never had that happen, but just curious about the reasoning. I never was one to blindly follow instructions without understandng the whys.
    Barry
    Sundance Hot Tub 365 gal, acrylic
    (2) 2.5 hp pumps
    ozonator
    Northwest Ohio resident

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •